Have Frame::script() return a reference

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 248 matching lines @@
 }
 
 void FrameLoaderClientImpl::detachedFromParent()
 {
     // Close down the proxy.  The purpose of this change is to make the
     // call to ScriptController::clearWindowShell a no-op when called from
     // Frame::pageDestroyed.  Without this change, this call to clearWindowShell
     // will cause a crash.  If you remove/modify this, just ensure that you can
     // go to a page and then navigate to a new page without getting any asserts
     // or crashes.
-    m_webFrame->frame()->script()->clearForClose();
+    m_webFrame->frame()->script().clearForClose();
 
     // Alert the client that the frame is being detached. This is the last
     // chance we have to communicate with the client.
     if (m_webFrame->client())
         m_webFrame->client()->frameDetached(m_webFrame);
 
     // Stop communicating with the WebFrameClient at this point since we are no
     // longer associated with the Page.
     m_webFrame->setClient(0);
 }
@@ skipping 487 matching lines @@
     return adoptPtr(m_webFrame->client()->createServiceWorkerProvider(m_webFrame, client.leakPtr()));
 }
 
 void FrameLoaderClientImpl::didStopAllLoaders()
 {
     if (m_webFrame->client())
         m_webFrame->client()->didAbortLoading(m_webFrame);
 }
 
 } // namespace WebKit